There are several hamlets within the township, including Amwell, Belle Mead, Blawenburg, Bridgepoint, Dutchtown, Fairview, Harlingen, Plainville, Rocky Hill, Skillman, Stoutsburg and Zion.[30]

Township residents are served by three post offices located wholly within the township's borders: Belle Mead with ZIP code 08502, Skillman with ZIP code 08558 and Blawenburg with ZIP code 08504. A portion of the southern section of the township is serviced by the Princeton post office with ZIP code 08540.

The area now known as Montgomery Township was inhabited for approximately 20,000 years by Lenni Lenape tribal groups. The current Native American population of Montgomery Township is just under 0.1% of the total population.[9]

The first European landowners in what was to become Montgomery Township, such as Johannas Van Home and Peter Sonmans, were speculators who did not live on the land, but sold large parts of what they owned to companies that subdivided it into farm-sized plots for those who did intend to settle. Many speculators and early settlers were of Dutch descent from the New Amsterdam area (especially Long Island), which, after the British ousted the Dutch (1664), was renamed New York in honor of the Duke of York (the future James II). The Township was originally known as the Western Precinct of Somerset County (i.e. west of the Millstone River). Before the creation of Mercer County in 1838, the southern border extended to Nassau Street in Princeton. In 1798 the Western Precinct was organized as Montgomery Township, named for Colonel Richard Montgomery, who fell fighting for the patriot cause in the Battle of Quebec at the start of the Revolution (1775).

Most of the land is flat and fertile, running westward from the Millstone River to Province Line, which divides Somerset from Hunterdon County and once marked the division between East and West Jersey. Farms of 300 to 500 acres (2.0 km2) were common, some owners keeping a few slaves to work the land and serve in the household. The aim of the early settlers was to produce as many of the necessities of life as they could: subsistence farming, in other words. Each farm had a vegetable garden, orchard, pasturage and fields for grain, as well as a stand of timber to be selectively cut for fuel. What became known as the Harlingen Tract (1710) included part of Sourland Mountain. Each farm on the flatland was assigned a separate strip of woodland that ran up to the Hunterdon border, all crossing Rock Brook. At points along the stream mills were built either to saw lumber or to grind grain. Other early mill sites were at Rocky Hill on the Millstone River, Bridgepoint on Pike Brook and on Bedens Brook near Blawenburg.

Settlement began in the first quarter of the eighteenth century. When churches, schools, general stores, blacksmith shops and hotel/taverns were built, they tended to cluster at intersections or other important points. For example, the intersection where the Carrier Clinic now stands used to be called Plainville or Posttown, having in the nineteenth century a post office, store, school house, blacksmith and wheelwright shops, as well as a hotel/tavern where the circuit judge presided. Most people walked to where they wanted to go. Schools were generally spaced no further than four miles (6 km) apart in order that no child would have to go more than two miles (3 km) to get to one. Churches marked the most important centers. The Dutch Church's earliest congregations first gathered in farm houses. The first church building at Harlingen dates to around 1750 and was called the Church at Sourland. The church at Neshanic in Hillsborough Township was established in 1752. In the early years these two churches shared a single pastor, and up to about 1800 they conducted their services in the Dutch language. One such pastor was Martinus Van Harlingen, who gave his name to the village, to the church that now bears his name, and to the local Historical Society. The Blawenburg church, an offshoot of the one at Harlingen, dates to 1830 and was erected in three days.

During the Revolution, the Township was the scene of marches by both British and patriot forces and of clashes between them. In the century that followed the movement of goods and people was accelerated by increasingly swifter forms of transportation. First was the building of the Georgetown and Franklin Turnpike between Lambertville and New Brunswick (1820-22: Rt. 518). Next came the digging of the Delaware and Raritan Canal along the east side of the Millstone River (1834). Railroad construction followed with the Delaware and Boundbrook Railroad (later the Reading), which established depots at Skillman, Harlingen and Belle Mead (1875). In the early years of the twentieth century, the arrival of the automobile, of electricity and of the telephone brought further growth and change. In consequence, and over time, the one or two room schoolhouse was supplanted by the central school, post offices were consolidated and most of the hotels/taverns disappeared. The crossroad hamlets that once offered basic services of general store, blacksmith shops and the like disappeared also, many leaving only their names to mark a road or an area: Skillman, Bridgepoint and Dutchtown are examples.

The paving and realignment of roads, and the building of new ones, came toward the end of the transportation revolution. A new major north-south highway, Route 206, was created in 1927. Before that time Montgomery and Mount Lucas Roads were parts of the chief north-south route through the center of the Township. Farming continued despite many changes in the economy and in agricultural practices. In the late nineteenth century subsistence farming was giving way to specialized operations, such as dairying, poultry farming, and fruit orchards. As the twentieth century drew to a close even these ventures no longer offered the farmer an easy existence, given the rapidly appreciating value of the land, over against the low prices of products produced on it. As farms became less and less profitable, the land was converted to other uses. For example, in 1898 the facility for the treatment of epileptics was built on farmland between Blawenburg and Skillman. Since the Second World War, housing developments, shopping centers and business parks have sprung up, leaving as remnants of the long tradition of agriculture in Montgomery roadside stands, riding stables and the like.

As rapid growth throughout the Princeton region has spread suburban sprawl across the Township, the push to limit runaway development and to acquire open space has become an urgent concern of the community. In the last decade of the twentieth century, Montgomery's population nearly doubled; currently, it is the fastest growing township in the county.

There were 7,635 households, of which 48.5% had children under the age of 18 living with them, 70.9% were married couples living together, 6.7% had a female householder with no husband present, and 20.4% were non-families. 17.7% of all households were made up of individuals, and 7.2% had someone living alone who was 65 years of age or older. The average household size was 2.90 and the average family size was 3.31.[9]

In the township, 30.8% of the population were under the age of 18, 5.0% from 18 to 24, 22.3% from 25 to 44, 32.0% from 45 to 64, and 9.9% who were 65 years of age or older. The median age was 40.8 years. For every 100 females there were 94.2 males. For every 100 females age 18 and over, there were 89.1 males.[9]

The Census Bureau's 2006-2010 American Community Survey showed that (in 2010 inflation-adjusted dollars) median household income was $146,100 (with a margin of error of +/- $16,235) and the median family income was $167,889 (+/- $10,202). Males had a median income of $110,549 (+/- $4,286) versus $80,268 (+/- $15,872) for females. The per capita income for the borough was $62,642 (+/- $4,981). About 1.4% of families and 2.3% of the population were below the poverty line, including 1.7% of those under age 18 and 5.9% of those age 65 or over.[43]

There were 5,803 households out of which 51.1% had children under the age of 18 living with them, 75.5% were married couples living together, 5.3% had a female householder with no husband present, and 17.6% were non-families. 14.2% of all households were made up of individuals and 3.5% had someone living alone who was 65 years of age or older. The average household size was 2.99 and the average family size was 3.33.[41][42]

In the township the population was spread out with 32.9% under the age of 18, 3.9% from 18 to 24, 31.9% from 25 to 44, 24.4% from 45 to 64, and 6.8% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 97.4 males. For every 100 females age 18 and over, there were 93.8 males.[41][42]

The median income for a household in the township was $118,850, and the median income for a family was $129,150. 70.20% of the residents had a college education or better, and 89.8% are white collar. Males had a median income of $86,687 versus $55,441 for females. The per capita income for the township was $48,699. About 1.4% of families and 1.5% of the population were below the poverty line, including 1.2% of those under age 18 and 1.3% of those age 65 or over.[41][42]

Montgomery Township is governed under the Township form of government with a five-member Township Committee. The Township Committee is elected directly by the voters at-large in partisan elections to serve three-year terms of office on a staggered basis, with one or two seats coming up for election each year as part of the November general election in a three-year cycle.[7] At an annual reorganization meeting, the Township Committee selects which of its members will serve as Mayor and Deputy Mayor for that year.

As of 2015[update], members of the Montgomery Township Committee are Mayor Christine Madrid (R, term on committee and as mayor ends December 31, 2015), Deputy Mayor Ed Trzaska (R, term on committee ends 2016; term as deputy mayor ends 2015), Patricia Graham (R, 2016), Rich Smith (R, 2017) and Christopher Sugden (R, 2015).[3][44][45][46][47][48]

As of March 23, 2011, there were a total of 14,253 registered voters in Montgomery Township, of which 3,884 (27.3% vs. 26.0% countywide) were registered as Democrats, 3,297 (23.1% vs. 25.7%) were registered as Republicans and 7,068 (49.6% vs. 48.2%) were registered as Unaffiliated. There were 4 voters registered to other parties.[75] Among the township's 2010 Census population, 64.0% (vs. 60.4% in Somerset County) were registered to vote, including 92.6% of those ages 18 and over (vs. 80.4% countywide).[75][76]

In the 2012 presidential election, Democrat Barack Obama received 52.3% of the vote (5,549 cast), ahead of Republican Mitt Romney with 46.2% (4,904 votes), and other candidates with 1.4% (151 votes), among the 10,673 ballots cast by the township's 15,384 registered voters (69 ballots were spoiled), for a turnout of 69.4%.[77][78] In the 2008 presidential election, Democrat Barack Obama received 6,082 votes (55.3% vs. 52.1% countywide), ahead of Republican John McCain with 4,731 votes (43.0% vs. 46.1%) and other candidates with 123 votes (1.1% vs. 1.1%), among the 11,002 ballots cast by the township's 13,849 registered voters, for a turnout of 79.4% (vs. 78.7% in Somerset County).[79] In the 2004 presidential election, Republican George W. Bush received 5,086 votes (50.0% vs. 51.5% countywide), ahead of Democrat John Kerry with 4,950 votes (48.7% vs. 47.2%) and other candidates with 97 votes (1.0% vs. 0.9%), among the 10,171 ballots cast by the township's 11,980 registered voters, for a turnout of 84.9% (vs. 81.7% in the whole county).[80]

With the addition of the Montgomery High School in 2005, students were transferred from the old high school, now the upper middle school, to the current one located on Route 601. In late 2008 the high school added a solar panel field to save on rising energy bills.

Montgomery Township was one of the fastest growing school districts in New Jersey. In September 1992, the K-12 enrollment was 1,590 compared to 4,924 in September 2005. This represents a tripling of enrollment in thirteen years. However, since the 2005-06 school year, enrollment has been flat due to a dramatic slowing of residential development in town.[94]

Montgomery Township High School was the 61st-ranked public high school in New Jersey out of 328 schools statewide in New Jersey Monthly magazine's September 2012 cover story on the state's "Top Public High Schools", after being ranked 10th in 2010 out of 322 schools listed.[95]

As of May 2010[update], the township had a total of 168.21 miles (270.71 km) of roadways, of which 138.40 miles (222.73 km) were maintained by the municipality, 23.98 miles (38.59 km) by Somerset County and 5.83 miles (9.38 km) by the New Jersey Department of Transportation.[98]

U.S. Route 206 (with CR 533 overlapping it for a brief stretch) is the main road that goes through Montgomery. The other main county road that goes through is CR 518.

Limited access roads are accessible outside the municipality, such as Interstate 287 in bordering Franklin Township and Interstate 95 in bordering Hopewell Township.

In 2007, the Township of Montgomery purchased a 256-acre (1.04 km2) parcel of land once known as the North Princeton Developmental Center from the State of New Jersey, located in Montgomery adjoining Skillman Road and Burnt Hill Road. In addition, the Township acquired from the State the adjacent wastewater treatment facility on 7 acres (28,000 m2), behind the State-owned Skillman Dairy Farm. The NPDC property, originally established in 1898 as the "New Jersey Village for Epileptics," operated as a self-contained community that consisted of hospitals, housing, maintenance areas, schools, a power plant, a wastewater treatment facility and an on-site landfill. Later, it became the New Jersey Neuropsychiatric Institute. Most recently, and until 1998, the property was the New Jersey Department of Human Services' psychiatric care facility "North Princeton Developmental Center".

For years there were over 100 buildings on the Property, mostly in substandard, unsafe, unsanitary, dilapidated and/or obsolescent condition. Ninety-two of these buildings were abated and demolished summer 2007. The remaining handful of buildings have been boarded up in anticipation of possible reuse as part of redevelopment. Efforts are ongoing to remediate environmental conditions at the site and repair or demolish the dam and restore the lake. The property’s environmental contamination must be remediated and brought into compliance with applicable laws and regulations.

The original plan for the land was development, as advocated by then mayor Louise Wilson. The Township prepared a redevelopment plan and solicited redevelopment proposals for a "Town Square" concept which would have created hundreds of new residential and commercial units. However, no developers submitted bids.

Throughout the rest of 2008 and all of the next few years, the debate over Skillman Village changed. The local Republican team led by Kacey Dyer and Mark Caliguire proposed selling all of the land to Somerset County to create a passive-use park. The public support of this idea was overwhelming, causing it to be one of the deciding factors of the 2008, 2009, and 2010 elections. Louise Wilson and her team were voted out of office (the Republicans took complete control of the Township Committee with the election of Ed Trzaska and Patricia Graham on November 2, 2010).

In October 2010, Somerset County agreed to purchase the land for a passive-use park for $14.1 million. Planning continues for Skillman Park.[101]

^History, Montgomery Township. Accessed February 2, 2015. "Rocky Hill, which was the first village in the township, is now a separately incorporated borough, whose children attend Montgomery Township schools."

^Chan, Sewell. 'Is Ben Bernanke Having Fun Yet?", The New York Times, May 15, 2010. Accessed February 2, 2015. "In 1985, he left Stanford for Princeton. His children — Joel, born in 1982, and Alyssa, born in 1986 — enrolled in public schools, and for six years he served on the school board in Montgomery Township, N.J."

^Weber, Bruce. "Master of Public Administration", The New York Times, May 24, 2010. Accessed February 2, 2015. "John P. Lewis, who was an economic adviser to three presidents, largely on the subject of foreign aid, died Wednesday in Montgomery, N.J. He was 89 and lived at Stonebridge at Montgomery, a retirement community."

^Samuel, Neena. "John Milhiser Live from New York … Hofstra Alum Makes SNL Cast", News @ Hofstra, September 17, 2013. Accessed February 2, 2015. "Milhiser, a 2004 Film Studies and Production major from Belle Mead, New Jersey, will be a featured player in the show’s upcoming 39th season, which premieres Sept. 28 with Tina Fey as host and Arcade Fire as musical guest."